Roll the struts-master pom version number to 5-SNAPSHOT

git-svn-id: https://svn.apache.org/repos/asf/struts/maven/trunk/pom@483391 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index f01bb30..21a9399 100755
--- a/pom.xml
+++ b/pom.xml
@@ -27,7 +27,7 @@
    </parent>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts-master</artifactId>
-   <version>4</version>
+   <version>5-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>Apache Struts</name>